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January 2012

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Subject:
From:
Paul Edwards <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Paul Edwards <[log in to unmask]>
Date:
Mon, 9 Jan 2012 12:24:27 -0800
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Currently build product with these types of lamps...
Use water soluble flux and aqueous clean and have had a few fails...
Fails were in lamps with cracked/chipped glass bases...

Could be a mechanical induced failure due to the washing and drying process (high pressures nozzles, air knives and/or PCB brushes)...


Paul

Paul Edwards
Process/Quality Engineering
Surface Art Engineering


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Temkin, Gregg
Sent: Monday, January 09, 2012 7:46 AM
To: [log in to unmask]
Subject: Re: [TN] Cleaning water soluble fluxþ

I worked for 18 years at a cockpit display manufacturer, working with miniature T1 lamps.  I'd have a hard time saying right off the bat that cleanliness issues with the PWB is causing incandescent bulbs to not light unless sensitive drive circuitry is resident on the same board (which is not often the case).  There are dozens of causes that should be run to ground before looking at cleanliness of the PWB.

Gregg


-----Original Message-----
From: Gary Bremer [mailto:[log in to unmask]] 
Sent: Saturday, January 07, 2012 3:37 PM
To: [log in to unmask]
Subject: Re: [TN] Cleaning water soluble fluxþ

I am presently working as an contractor for the next few months then back to unemployment, last place I worked was Jet Propulsion Laboratory on the Mars Science Laboratory.  These are lighted panels for various aircraft and the company policy is for J-STD-001/IPC-A-610 Class 3  The failure is with miniature T-1 lamps that stop working after going through an baking process.  Other boards that use these lamps but use RMA flux do not have this problem, I suspect the cleaning process and the flux.  They do not check ionic contamination and handle the boards with bare hands and the operators even know when components are ESD sensitive or not.  I have recommended they change the cleaning process to an Aqueous type batch cleaner but this cost money which they do not wish to spend.  Their process person believes that their process is fine and something else is causing the problem (bad lamps, forming lamp leads, etc.).  This goes against all my knowledge and training.

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